This umbrella is made of 100% polyester, which is easy to clean, long-lasting, and waterproof. Eight sturdy ribs on this umbrella provide strong support. It includes a single wind vent to withstand heavy winds. The diameter is wide enough for a round, square, or rectangle patio table with four to six chairs. The umbrella is easy to crank open and has a push-button tilt that keeps you and your guests cool and comfortable while enjoying the sun and the outdoors. A base is not included with this umbrella and has to be purchased separately. The umbrella adds a chic flair to any outdoor patio aesthetic.